| 摘要 |
940,792. Pneumatic tyres. DUNLOP RUBBER CO. Ltd. April 12, 1960 [May 8, 1959], No. 15796/59. Heading B7C. A pneumatic tyre carcase comprises at least one parallel cord ply 17, Fig. 4, which extends across the sidewalls and tread and terminates at, or short of, the base 16 of each bead, and in each bead at least one filler 18 formed by a flat annular spiral winding of parallel side by side convolutions of rubberized filamentary material such as steel wire. The carcase ply or plies may be of rubberized, radially disposed steel or textile cords, and for a passenger car tyre, the arrangement may be as shown in Fig. 4, or two additional plies such as 17 may terminate at each bead to sandwich the arrangement of Fig. 4 therebetween. Fig. 1 shows a construction for a giant tyre, two bead wire cores 3 being incorporated in each bead to provide bulk, the steel cord ply 2 being sandwiched between the bead cores, two filler strips 4 of spirally wound steel wire being disposed one on top of each bead core, and the whole bead assembly being wrapped around by a bracing strip 5 of radial steel cords which extends from a point radially outwardly of the bead on the inner surface of the tyre sidewall, either to the bead toe, or as shown, right around the bead to terminate on the outer surface of the bead. In an alternative construction, four plies such as 2 are used, and three bracing strips 5, one of which terminates at the bead toe. In a further construction comprising three bead wire cores in each bead, each surmounted by a filler such as 4, six plies such as 2 are disposed in pairs between adjacent bead cores and axially inwardly thereof respectively,the whole being wrapped around by a bracing strip. |
